- The pump brings water from an outside, below ground cistern into a house.
- The system as a whole performs normally.
- We have checked repeatedly for dripping taps and leaks.
- The pump can cycle during the evening or in the night when no-one is drawing water for any purpose.
- The pump does not run long, we estimate from half a minute to a minute.
This often wakes my wife which is bad enough. Is it a sign of impending doom?